桅杆结构有限元模型修正与参数敏感性研究  

Finite-element model updating and parameter sensitivity research of high-rise guyed mast

作　　者：刘慕广[1,2] 乔磊 王雷 余先锋 张春生[4] 谢壮宁 张丽[4] LIU Mu-guang;QIAO Lei;WANG Lei;YU Xian-feng;ZHANG Chun-sheng;XIE Zhuang-ning;ZHANG Li(School of Civil Engineering&Transportation,South China University of Technology,Guangzhou 510641,China;State Key Laboratory of Subtropical Building and Urban Science,Guangzhou 510641,China;Guangdong Communication Planning&Design Institute Group Co.,Ltd.,Guangzhou 510507,China;Shenzhen National Climate Observatory,Shenzhen 518040,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510641 [2]亚热带建筑与城市科学全国重点实验室,广东广州510641 [3]广东省交通规划设计研究院集团股份有限公司,广东广州510507 [4]深圳市国家气候观象台,广东深圳518040

出　　处：《振动工程学报》2024年第7期1107-1114,共8页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51978285,52378514);广东省现代土木工程技术重点实验室基金资助项目(2021B1212040003);亚热带建筑与城市科学全国重点实验室开放基金资助项目(2021ZB11);广东省基础与应用基础研究基金资助项目(2024A1515011828,2024A1515011525)。

摘　　要：基于台风“圆规”激励下的实测加速度响应识别了深圳356 m高气象梯度观测塔的模态参数,结合带精英策略的快速非支配排序遗传算法(NSGA-Ⅱ)对气象塔有限元模型进行修正。结果表明:气象塔模态非常密集,且纤绳模态的参与程度较为显著。气象塔X向和Y向的基频分别为0.614 Hz和0.603 Hz,其前3阶弯曲模态阻尼比在1%~2%之间。塔身密度、纤绳弹模对塔身模态频率和振型有显著影响,高层纤绳的线质量和塔身弹模对其也有一定影响,但纤绳张力的影响较低。气象塔有限元模型修正后的风致响应高于修正前,并更接近实测结果,验证了修正模型的准确性。Based on the measured acceleration response under Typhoon Kompasu,the modal parameters of the 356 m Shenzhen Meteorological Gradient Tower(SMGT)are identified.The Non-dominated Sorting Genetic AlgorithmⅡ(NSGA-Ⅱ),which is a fast and elitist genetic algorithm,is applied to update the finite element(FE)model of SMGT.The results show that the vibra⁃tion modes of SMGT are very dense,and the involvement of cable vibration modes is obvious.The fundamental frequencies of SMGT in X and Y directions are 0.614 Hz and 0.603 Hz,respectively,and the damping ratio of the first 3 order bending modes are about 1%~2%.The tower density and cable elastic modulus have a significant effect on the modal frequency and mode shape of SMGT,the lineic mass of high-rise cable and tower elastic modulus also have a certain influence,while the cable tension has a relatively low influence on the modes of SMGT.The wind-induced response of the updating FE model is higher than that of initial model,and closer to the actual measurement,which verifies the accuracy of the updating FE model.

关 键 词：模型修正 风振响应 桅杆 模态识别 实测 

分 类 号：TU311.3[建筑科学—结构工程] TU323.4